Nanosecond rhymes with:
millisecond, millisecond, arcand, awakened, beckoned, blackened, chickened, darkened, likened, millisecond, quickened, reawakened, reckoned, second, sickened, slackened, thickened, weakened
Nanosecond sounds like:
naismith, nakamoto, nascent, nascimento, negent, neighmond, nesmith, neugent, nicknamed, nishimoto, nonmanagement, nugent